Make SUPPORT_MULTI_SIM recognizable in bp am: f34142e084

Original change: https://android-review.googlesource.com/c/device/google/gs101/+/3115519

Change-Id: Ie9a88d4f5265538e22b72382d042ecfe603f12ea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>